Telephone system



July 9, 1935. H. M. FRIENDLY 2,097,712

TELEPHONE SYSTEM Filed Nov. `14, 1931 5 Sheets-Sheet 1 as e" i I July 9, 1935. AH. M. FRIENDLY TELEPHONE SYSTEM Filed Nov. 14, 1951 July 9, 1935- H. M. FRIENDLY 2,007,712

TELEPHONE SYSTEM Filed Nov. 14, 19:51 5 snee'ts-sneet 5 iii Ylaminati July `9; 1935v TELEPHONE4 SYSTEMl 4' I ;He'rbert..M.,Friendly, deeeasedplateof Chicago, Ill.B by li/iilton` S. Friendly and Central Trust u Company of Illinois (novi1 by change of name Central EepublicwTrust Companyb Chcago, 1 lll@ ca -executors, assignors ftor Milton S.Y

e Friendly, Chicago; lll.,r0scar N. Friendly, Salt..- n Lake City, Utahgand Central'Republic Trust Company, Cliicago,l ll., acorporation of Illinois,l l

deceased restes under-hammer Herbert 1yr. Friendly,

` l Q l. Application November 14," issigserial No. 575,135V

v 2i claims. (c1. :nes-7.1)

, vThe "present invention relates in generalto automatic telephone systems, and more particu larly'Av to measured service automatic telephone syster'nsffj One ofthe objects of the present invention is to provide means under the control of the 4called subscriber whereby he can reverse the metering .charge from the calling subscribers line'to his own. y i i v l Another object isI to VVprovide mechanism by which rthe called subscriber may -makethis regve'rsal at his option `at any time during Vthe conversationjwith'the calling subscriber.

`f Another object is to provide a `method of makin'g a'charge to the line ofY the called subscriber athisoption in accordance with the'length of the conversation. f Another object is to vary this time charge in `accordance with thetelephone trahie in the exchange.-V I i `A `furtller object is toprovidemechaioism'for rendering it impossible to reverse the charge with afrestricted'class of called subscribers.v i t A further object is to providemeansfor inforrri`` ing thev subscribers 'when talking the amount of charge being made.V l

A s'flll" further object is to inform thesubscriberslv/hether the charge is being made against the calling por called party.

` l"There arev other objects-ofthe inventiony'which -together with .the foregoing, .will be described in the detailed specication" that is vto follow, taken 'inconjunction with the accompanying" drawings m'atic telephone system o Vthese-'called Strowger Qandforming a part thereof.

` "The invention has v been illustrated in type employing `first Vselectors and connectors. Obviously a greater number of selectors may ne icmployed if necessary or desirable in accordance "with well known principles. t `In practicing the invention a metering :device is Yprovided 'for ea'chlinel which it is desired to charge. Atiinin'gswitcliis 'associated with each ilrstseleetor and'with each connector in order to 2 f bringjabout thetiming'oi 'the conversation." A

fpu'sli button is provided at' each subscribers telephoiieby which the called subscriber may` reverse thecharge.

" `Briefly, the operation of the invention proceeds in the following manner: p Y' The' connection between the c'allingand the V called subscriber is established in thelusual'man- 4ner through the calling subscribers line switch,

"an iiile first selector and yan idle connector.

V"Whe'i the subscribers are connected the. timing switohindividual'to the first selector isf operated `periodically to `actuate the meter-associated with the calling'subscribers line.- -In the event the Vcalledv subscriber is one of those subscriberswho Vmayreverse the charges he presses the push button at this telephone,"whic h bringsabout the -`cessation "of the operation of the timing'switch to 'thefrst selector and the initiationY ofv the operation of the timing switch individual-tothe connector. TheY operation of thel timing switch individual to the connector causes the meter associated withthe called subscribers-linev to b e aotu-` j Vated periodically. Audible signals Varefapplied to the line at short intervals before the charge is made; thetone being of one pitchto inform the .called subscriber ifwthef charge isV being made aganst'ihiin and of another pitch toinforrn the calling subscriber if vthe chargeisbeingimade against him. 3g l Referring now to the drawings comprising Figs.

l to A3 inclusive, the invention has been illustrated 'in connection with a simple'step bystep typeof automaticftelephone system wherein the Aapparatus andcircuits Yare `shown by means of the usual conventional diagrams.

Inl Fig. -l in theupper kleft hand corner orl the `sheet a calling subscribers telephone is illus.-

trated, designated with'the referencecharacter mitter, receiver,v switch hook. and ringer.` I In addition, thev telephone is provided with a push 'button E02 whose contacts normally shorty circuit f a resistor included in theline circuit. 'Reference character RS designates the usual typof rotary line switch individual to the line of thesub- -scriberat sub-station T, The line switch isfprovided with the usual `line relay IUS, switching relayv |08 and motor magnet |l4.` The motor magnet H4 is operated to advance theswitch wipers HQ to `I I3, inclusive, step by .step .over associated bank contactssuch 'as l I ZI` to 124, -inclusivejin search of an idle trunk. A 'metering *device l of any usual or well known type isfassociated withcach line switch;V The rotary switches BS vhave access to. trunk Iline's extending to first selectors such yas the iirst's'elector S.

'j `'I he selector S is'"generally. `off the usual and` well known Powell type, vhaving controlling relays E25 to l32, inclusive, and being providedlwith the usual vertical magnet |33; rotarymagnet |34,

andV release magnet 135.] The selector; S v1 has y'access lto IB groups of trunk lines terminating in l0 groups .of Vbank contactsgsuch as Vthe bank contactsl 185 to 1.81, inclusive, accessible to wipers |36 to l38, inclusivel A rotarytiming VT.- The telephone comprises the usual trans- ,lease magnet 2 I I.

switch RS-I, which may be of the same general mechanical construction as the rotary switch RS, is associated with each first selector such as S. The rotary' switch RS I has access to bank contacts which are connected to metering and tone machine mechanism M. 'I'he metering andtone machine mechanism M is common ,to all. the metering switches, such as RS-I, associated with the first selector S. This metering` equipment consists essentiallyof two motor driven shafts |14 and I 8| upon which'are mounted commutating segments |12 and |13and |15 to`|18, respectively. The commutatingsegments |12, |13, |11 and |18 are connectedto thebattery, while the commutating segmentsY |15 and |16 go to tone machines and may generate audible signals of different pitch.

The trunk lines accessible to the rst selectors S-I extend to connectors C of the usual step by step type. The connector C is provided with control relays 200 to 2|0, inclusive, and theV usual vertical magnet 2|2, rotaryl magnet 213, and re- The V connectors such as C Yare divided into I groups, each group having access to |00 subscribers lines. Thus the connector C has access` t hrough the wipers2|6 to 2I 9`, inclusiv`e, and bank contacts such as 292 to 295, inclusive, to the lines of |00 subscribers. A timingswitch RS-Z is individual to each connector.. This switch may be of the same general mechanical construction as thek switch RS previously described, having a motor magnet 264 u i for advancing the switch wipers 213 to 216, in-

vrotary line switch RLS-4.

clusivelabout itsassociated Ybank contacts. 'Ihe bank contacts of the timing switch are connected to common metering lequipment M-2. i The metering equipment M-Zconsists essentially of two .motcr driven shafts 288 and 289, which are provided with the commutating segments` 282, 283, 284 and 281 and 285 and Y286, respectively. 'I'he 'commutating segments 284, 281, 285 and 286 are connected to the battery, while the commutating segments 282 and 283 areconnected to tone machines capable of generating signals of dif- `ferent pitch.V In addition, acommon metering device M-I, whichflconsists of a Yclock driven wiper 26,1 adapted to" engage circular contacts twenty-four in 'numberf For each hour of the be inv engagement with a'certain'particular-contact. Y

As 'before mentioned, -the 4connector C has access to'called telephone lines of |00 called subscribers, such as Ythe subscribers` located vat statlonsT-I to`T-3, inclusive. of the called subscribers lines Yis provided with rotary line Yswitches such as RS-'3 of identically the same construction as. therotary switch RS previously described.Y The'telephone sub-station circuits of the'calledsubscribers such as *IL-I are of4 identically the same construction as the telephone substation 'I'. previously described, being provided with'the usual transmitter, receiver, switch hook and ringer, and, in addition, push button 33 6 and resistor 335. A; slightly modified form of substation'circuit is shown at.T.-2, wherein the push buttoni331 is employedto'ground one'side ofthe line. The circuit of theY telephone sub-station T3 is of the usual type, not being provided with a push button. This is toeillustrate the line of a called subscriberwho has free service. The line of the sub-station T-3, in addition to terminat-v ing in the contacts ofthe connector C and other connectors oi the same group, terminates in the In addition relays, such as 3I1 to '319, are provided in association with this line for the purpose'of preventing the telephone subscriber at station T-3 from altering the metering charge ofthe calling subscriber whenin connection with his line in' anymanner.

While the timing switchesRS-I and RS-2 associated with the first selector S and connector C, respectively, have been illustrated as individual to these switches, it will be understood that they may be made common by the use of finder switches or in anyother suitable or well known manner.

Having briefly described the apparatus and circuits shown in the drawings, their detailed operation Ywill now be described. For this purpose it will be assumed that the subscriber at sub-stationA T desires to call the subscriber at sub-station T-I. In order to accomplish this result the subscriber at sub-station T will remove his receiver from the switch hook, thereby completing a clrcuit which extends from ground by way of back contact and armature II1, line conductor IOI,

.contacts of push button |02, switch hook contacts,

receiver and transmitter in series, line conductor |00, armature |16 and its back contact, winding or line relay |09, andY thence to battery. The slow acting line relay |09 is energized over this circuit' and serves'to complete a circuit which extends from 'ground by way 'of armature |20 and its front contact, switching relay |08, back contact and armature of motor magnet |14, and then through the Winding of this magnet to battery, and at armature ||9 and its front contact serves to connect the test wiper |II to the above circuit at a point midway between the switching relay |08 and motor magnet I I4. In the event that the Y switch wipers to I 13, inclusive, are in engagement with a busy trunk line, ground will be con,- nected to the bank contact associated with the test wiper III, and the motor magnet |I4 will be operated to advance the switch wipers III)4 to |173, inclusive, until they are in engagement with the bank contacts associated with an idle trunk line. At this time there will be a circuit completed for the switching relay |08 in series with the motor magnet 4. The switching relay |08 upon operating connects the meter ,|01 to the metering wiper I I0 at armature I I5 and its front Contact, opens the test circuit of the motor magnet I I4 at armature I I8 and at the front contactof this armature prepares a holding circuit for the switching relay |08. At armatures I I6 and I I1 the operation ofthe switching relay I 08 serves toiopenthe circuit of the slow acting line relay |09 and to extend the talking conductors |00 and |01 to the wipers I|2 and II3. It will be assumed that the trunk .selected by the operationof the line switch is the trunk line terminating in the bank contacts |2| to |24,inclusiv. Consequently, upon the extension of the talking conductors |00 and |0| as described there will be acircuit completed extending from ground through the lower winding of the line relay V|29, of the selector S, back contact and armature I 48, bank contact |24, thence through the calling subscribers telephone, bank Contact |23, through the lower winding of the electropolarized relay |21, armature |41 and its back contact, and thence through the upper winding of the line relay |29 to battery. The line relay |29 is energized over thisvcircuit and upon 'operating opens a point in the circuit of the disconnects ground from certain bank contacts front contact,

Yclusive of the armature 24|.

.to 2|9 passing over busy lines.

resting contact of off-normal spring 258, relay 206 and vertical magnet 2|2 to battery. The vertical magnet 2I2 is operated to raise the switch wipers 2| 4 to 2|1 inclusive, opposite the level of bank contacts'corresponding to the digit of the called subscribers number that has been dialed. `The slow acting relay 206 is energized in series with the vertical magnet 2|2 and serves to prepare a new circuit for the vertical magnet 2|2. At the rst off-normal step of the switch the circuit of the vertical magnet is changed and may be traced over a path extending from ground by way of armature 23| and its back contact, armature 233 and its front contact, ofi-normal contacts 2I5, armature 234 and its front contact, relay 206 and vertical magnet 2 I2 to battery.

A short interval of time after the calling subscribers calling device restores to normal, the slow acting relay 206 is'de-energized to open a point in the circuit of the vertical magnet 2|2 and to prepare a circuit for the rotary magnet 2|3.

When the calling subscriber operates his calling device in accordance with the last digit of the called subscribers number, there will be another series of interruptions produced in the line circuit, `which includes the line relay 204 and this relay will be de-energized a corresponding number of times. At each de-energization of the line relay 204 there is a circuit completed, which extends from ground by way of armature 23| and its back contact, armature 233 `and its front contact, off-normal springs 2|5, armature 234 and its back contact, back contact and armature 24|, back contact and armature 254, and rotary magnet 2|3 to battery. A branch of this circuit extends through the slow acting relay 209 to battery. The rotary magnet 2|3 is operated a plurality of times to advance the switch wipers 2|4 to 2 I1, inclusive, into engagement with the bank contacts associated with the line of the subscriber at sub--station T-I, which it will be assumed are the bank contacts 292, 296, 294 and 299, respectively. The slowA acting relay 209 is energized in parallel with the rotary magnet 2 I3 and operates atarmature' 243 to prepares. circuit for the busy test'relay 208 and to prepare an alternative circuit for itself and the rotary magnet at armature 244 and its front contact, ex-

' This result is for the purpose of maintaining the circuit of the rotary magnet, irrespective of the energization of the busy test relay 208 in the switch wipers 2|6 This result is brought aboutby the test wiper 2|1 encountering a ground potential upon bank contacts it rotates over, and bringing about the operation of the relay 208.

It will first be assumed that the line of the called subscriber at sub-station T-| is busy. In this instance there will be a ground potential applied to the bank contact 296, and when the test wiper 2|1 is brought into engagement with this bank contact a circuit will be established ex-k tending to the busy test relay 208. The busy testrelay 298 upon operating prepares a locking circuit for itself at armature 240, opens a point in the rotary magnet circuit at armature 24|, and at armature 242 applies ,the busy tone to a conductor extending to the calling telephone. A

vshort interval after the cessation of the last series of impulses the slow acting relay 209 is deyenergized to open another point in the rotary magnet circuit at armature 244 and to establish the locking circuit of the relay 209 at the nor- -mally closed springs controlled by armature 243.

lby way of front contact ancl armature 2|4, ar-

mature 240 and its front contact, normally closed springs controlled by amature 243, armature 252 and its back contact and relay 208 to battery.

Upon the calling subscriber gettingV the busy signal he will place his receiver upon the switch hook, thereby bringing about the de-energization of the line relay 204. A short interval after the retraction of the armature 23|, the slow acting relay 205 is cie-energized to complete a circuit for the release magnet over a path which may be traced from ground by way of armature 23| and its back contact, amature 233 and its back contact, armature 223 and its back contact, oil'- normal spring 251 and its working contact, back contact and armature 21| and release magnet 2|| to battery. 'Ihe release magnet 2I| is energized to restore the switch wipers 2|6 to 2I9 inclusive, to their normal position in the usual manner. The de-energizatlon of the slow acting relay 205 also disconnects ground from the release trunk conductor |92, which has established a holding circuit for theV selector switch S and the line switch RVS. In the selector switch S the switching relay |29 is de-energized to complete a circuit for the release magnet |35 over a path which extends from ground by way of armature |59 and its back contact, back contact and armature |49, armature |52 and its back contact, working contact of off-normal spring |51 and said spring, switch wiper of timing switch RS-I ilrst bank contact, and release magnet |35 to battery. The release magnet |35 is energized to restore the switch wipers |36 to |39 to normal. The disconnection of ground from the release trunk conductor also brings about the de-energlzation of the switching relay |99 of the rotary line switch RS, which upon de-energizing connects the calling line to the line relay |99 so as to prepare the rotaryline switch for another call.

It will now be assumed that the line of the substationV T-I when called by the subscriber at sub-station T was idle. In this instance when the switch wipers 2I6 to 2 I9 inclusive, of the connector C are brought into engagement with the bank contacts 292, 296, 294 and 299, there will be no ground potential upon the test contact 296 and no circuit will be completed for the busy test relay 209. Now a short interval after the calling device CD at the calling sub-station T is reture 350, and motor magnet 344 to battery. The

switching relay 2|9 is energized over this cir- -cuit and operates to establish a. locking circuit for itself at armature 253 to open a. point in the locking circuit of the busy test relay 209 at armature 252 to open a point in the circuit o! the rotary magnet at armature 264 to apply ground to the test wiper 2|1 at amature 255 and to complete the ringing circuit at armatures 250, 26| and 256. The application of ground to the busy -test wiper applies a full ground potential to the conductor 396 to busy the called line.

'I'he switching relay 349 inthe line switch RS-3 associated with the called sub-station T--I is energized, but by reason of an 'interlocking de# vicegcontrolled" bythe armature of .thev line relay:

'and'armature'ZSiL'wip'er 2|1, bank contact 223,

conductor 301 over the lineof thecalled telephone through its ringer, condenser, switch hook; springs ofpush buttonl 236, overline conductor]conduc-v tor 302, bank contact"294, wiper ZIB, armature 250 and its frontfcontact, armature 236 and its backcontact, upper windingvof ringcut-oV relay 201 and thence to battery either throughv the ringing generatorR or 4the armature 251i anditsy back contact. The `relay 201 -is not operated by' the alternating' current passing over this circuit. Ringing currenty is intermittently Y applied to the called line until the` subscriber vat sub-station Tv removes `his receiver, `whereupon thereis a circuit for" direct `current over the line`of the called'telephone and' therelay 201 isenergized to establish a locking` circuit for itseli` at armature 231. This locking circuit is established vbefore any other armature or springs Vof the relay are operated.v The. relay'2l1'V upon operating opens a point in'its own energizing circuit atarmature 236' at the front contact of.k this armature, com# pletesapoint in the talking circuit, completes' al point` in the'circuitfofV a' supervisor signal. at armature V238, opens' al point in the ringingv circuitat'armature 239 and vat the front contact of this armature completes the talking circuit; The talking circuitI.extends to the called telephone over the Yheavy conductorsshownin the drawings. `The calling telephone is supplied with `talking current through the windings of vthe line relay 204, while the called telephone issupplied` with talking current through the windings ofv the' relays 200 and 20| over a circuit which maybe traced 'from ground `through the lower winding of thefrnarginal relay 20|', lowerwinding of back, bridge relay 200,`front `contact and armature 230, front contact'and armature 256, wiper 2l1,bank contact 298, conductor 301, called telephoneline, conductor 302, bank contact 284,'wiperf2l6, `ar.

mature 250 and its'front contact, armature 236;

and its front Contact, upper winding Otback bridge relay 200 and upper winding of marginal v l Yhezcannot alter the charge being assessed to the relay 20| to battery'. The back Vbridge relay `200 on thev marginal relay 20E Aareenergized over thisl circuit.' The relay'20l upon operating-prepares, a point in the circuit of the dilerential relay 203 at armaturey 224.jand at armature 225 opens a point in the circuit of the upper winding oi.' vithi's'relay. The relay 20,0, upon operating Vopens afpoint in the circuitV of a supervisor signal at armature 220, and its backcontact, and` at the iront contact of this armature establishes 'a further locking circuit for the switchingre lay-'210, completes a circuit for the lower winding of the diiierential relay 203 at armature 22I, andv at'` armature 222 A,prepares a circuit for theffupper winding ofthe differential relay. Ano-ther result of -the operation' ofthe relay 200fis that at armature 223 apoint in `the Vcircuit of the release magnet is opened andat thefront con-` tact ,of this armature `a ,point in thecircuit of a supervisor signal Vis established. The4 circuit for the lower winding ofthe differential relay 203 may b'e traced fromground by way' of front,

contact and armature 2M, armaturer 22| and its frontcontact; armature224 and its front contact; and lower "windingof differential relay 203 to battery. The differential relay 203 .is"ener y g'izedoyer thiscircuit to establish'a locking'circuit for its 4lower winding at armature 229 `t`o reversal vof theconnections of` the V4line relay as described bringfabout the operation ofV ythe timnig switchI-"RS-if, 4associated with the selector S as -will befexplain'ed. The circuit for the' m04' torfrnagne't 285i may be traced'from Agroundby way oi'tront'clontac't and armature' 2 I4, armature racimo 'its fronrcjo'ntact, the barils Contact with which'the switchfwiper 215 is inen'gagement'with K when the s'witchfRS-V-Z is'in normal or-initial position, switch wiper" 215, back contact and agri-,-

mature 265, and motor magnet 264 to battery.-

[The motor magnet 254,is operated overjthis circuit to "advanceuthe 'switch wipers Z13-to 216,

incliisive", ofV the timing switch RS-Z intoengagenient withftheV vsecond set of bank contacts. The operation ofA the timing switchrRS-2 Vis thus initiated by the yresponse offthe; called party atsubistati'on but itsy ropi-ration has no particular'v function atthe present-'time and the description of `its operationfwill be left until it does function; which occurs when the charge is. to beassesse'dagainst ,ther called line. f v Y It isptorbe noted at this` time that whenthe switchhwipers zlyto 2l 9 inclusive, of the Vconnectorfswitch C are brought intoY engagement with the bank contactsiassociated with the called line Yof the substation l., there was a circuit completed forthe high,resistance relay 202, if this call'was made ,at VYcertainperiods Vof theV day. This depends `upon the voperationoffv the clock Vswitch, M-i which may be of anyusualor well conductor may be regulated.V The connection of I battery to'this conductor determineswhether or not the called party may reverse the charge by the use ofinstrumentalities ashis sub-station. Ii batteryis not connected to this conductor,

calling line.V Thismay be desirable at certain periods of the day, as warranted by 'traiiicy conditions.A

however; that .atthe time the switch wipers of theconnectr were brought into engagement with' the'bankcontacts'of the called line batterywas.

connected by the'clock4 switch M-l to the corn-v rnon conductor 240. In this instance vthere vis a circuit completedffor the relay`20`2', which'ex- 'tends from ,battery through the winding ofthe relay 232, front contact Vandarinature 245,`s'witch wiper 2K5, bank contact 292, conductor 300, me-

ter352 .ofthe called line, associated with switch Rsi-3 toground. The meterl 352 is not voperated over this circuit vby'ireasonof the high resistance oi the relay 2`02. However,'this relay isenergizedto, prepare' a circuit for the upper windingof the .differential relay 203 at armature 22B.j This. prepaiesa circuit by which the 'called'line Ymay` reverse 'the charges. L

" Referring now to the descriptionof the opera-` It will be. assumed "in the present instance,y

tionfby which' a time charge is assessed tothe meterion the calling line, it will be recalled that the-response of the called. party brought about a reversal of battery over the conductors |91 and |98. reversal of battery brings the current ilowin the lowerk lining of the electro polarized relay |21 in the Vsame direction as the current flow in its upper winding andthis relay, is energized to completea circuit for the relay |26 at armature |43 and to complete a circuit at amature |46'for'the motor magnet of the timing switch RS-I. The-circuit for' energizing theV motor magnet |58 extends from ground upon the release trunk byway of armature |45 and Vits front contact-,bank contact with which the switch wiper |6| is in engagement in normal position of the switch'wipers,` said wiper, back contact and armature |63 and motor magnet |58to battery. 'Thejslowactingfrelay |26 upon operating I: prepares `a circuit'atarmature y|42 for therelay vThe' motor` magnet ,|58 is operated over the above traced circuit to advance the switch wipersv |50to |62 of the timing switch RS--I associated with the selector S, one step into Yengagement with the second set of bank contacts. The movement of the switch wiper ISI opens the pre-Y viouslytraced circuit for the motor magnet |58. However, the operation of th'evswitch wipers and more particularly-the switchY wiper |62 into engagement with the second set of bank contacts prepares a circuit for the operation of the motor magnet-|50, which includes the interrupter or commutator |13 .mounted upon the shaft|14 and connected to ground. As explainedbefore, the

shaft |14 'is being constantly. rotated at a predetermined speed.l All bank contacts, except the lastfour Vandthe first one of the rotary switch RLS-I. are multiple together and connected to the. armature |1|` of the relay |10.v

Consequently, as ythe shaft |14-is rotated, ground is periodically connected to the winding of theV motor magnet |58, which is periodically oper,- ated to advance the switch wipers |59 to I62fover the bank contacts. switchv wipers of the rotary switch RS-I continues as a result of the impulsin-g circuit to motor magnet |58 described, until the switch wipers are brought intoengagement with the fourth ifrom the lastvset of bank contacts, whereupon theimpulsing circuit for the motor magnet |58 is transferred to the commutator |18 mounted upon the shaft |8|. This shaft is moving at a slower speedthan shaft |14 and consequently the switch wipers are not advanced so rapidly. Furthermore, during one revolution of the commutator |18, only one circuit is completed for the motor magnet |58, which further delaysV the advancement.v When Vthe switch wipers are brought into engagement with the third from the last set of bank contacts there will be a tone connected to the talking'circuit over a path which extends from the tone machine by way of the conductorlSI, commutator |16, condenser |82, bank contact with which vthe switch wiper |80 is in engagement, armature |66 and its back contact, condenser |61, to the talking circuit. The tone machine connected to the conductor |9| givesva distinctive tone slightly in advance of the metering charge to apprise the calling party that a charge is about to be made. When the switchV wipers of the vswitchlftS-I are rbrought intdengagement with the second from the last set of bank contacts there is a circuit completed for the relay |10 over a pathwhich may be traced `The advancement of the from the metering battery Bthrough the commutator |11 when in the proper position, Ywiper |59, second from the last bank contact, and upper winding of relay |10 to ground. Y The relay |10 is energized over this circuit tor establish a locking circuit through its lower winding to ground upon the release trunk conductor at armature |80 and to disconnect the bank contacts that'control the periodic operation of the motor magnet |58 of the rotary switch RS-I from the commutator |13 and connect them to the commutator|12. Thepurpose of this operationis for the reason that the usual practice in assessing telephone charges is to assess an initial charge for an interval of time; thereafter to assess'a charge for every minute or a shorter interval of time. ByY reason of the number `of segments on the commutator |12 the switch wipers are stepped more rapidly to accomplish the difference in charges. The operation of the switch wiper |60 into engagement with the second from the last bank contacts connects the tone from the tone machine connected to the conductor |90 to the talking circuit whereby the calling subscriber is apprised that his meter is being operated to assess the charge. The motor magnet |58 continues to be operated periodically by vreason of the ground connection through the commutator |18. The purpose of switching the control of the' motor magnet during the last four steps of the metering switch RS-I is to provide for uniform operation of the switch over the last segments. This permits the tonesV to be applied. to the talkingk circuit for a uniform interval, irrespective of theV speed of operation of the, motor shaft |14.

It should be mentioned at this timeA that the speed of the motor shaft |14 may vary in accordance with the time of day, or in accordance with trailic conditions in the exchange so as'to provide a greater charge in Vthe event that the call is made during a peak load or during ordinary load.

`When the switch vwipers are stepped into engagement with the last set of bank contacts there is a metering circuit completed for energizing.

the meter |01 of the calling line. This circuit may be traced from the metering battery through the commutator |11, wiper |59, last bank contact, back Contact and armature |40, bank contact |2I, wiper ||0, front contact and armature and meter |01 to ground. 'I'he meter |01 is operated over this circuit to assess a charge against the calling line.

` It will be understood that during the operation of the rotary switch RS-|, which has been initiated by the removal of the receiver at the called telephone the subscribers may carry on their conversation. The operation of the rotary switch IRES-l continues past the last set of bank contacts and the switch wipers 59 to |62 in their continued rotation are brought into engagement with theirv normal setv of bank contacts. The operation of the switch RS-I continues in identically the same manner as described, with the same results. Its operation during this second movement is faster than the first by reason of the operation of vthe relay previously described. y

In the usualrcourse of ,events the operation of the timing vswitch RSI 'will continue until the calling subscriber replaces his receiver upon the switch hook at the end of the conversation and the meter 01 willk be assessed in accordance with the time the telephone has been used and the andthis relayawillbe de-energized to open the circuit of the relay 205. f A short interval of time vthereafter the relay 2.65 lede-energized to removcground from thefrelease trunk conductor ISES, whereby the switching relays i282 and the fselector S andA i638 in the line switch' RSl are .and` this Arelayv is deenergized :t restore a 'con-v nection of the' commutator V13 and its associated vrestore their respective circuits l Attention, Lis also directed tothe act that` if de-en'ergized.v The de-energization of the relay |28 in theselector `switchy S brings` about its release in the same manner ashas already been described. In order to restore the wipers of the rotaryswitch RS -I to normal position, 'when'the relay |28 isde-energizedjthere is a circuit cornpleted'which extends .from ground lbyway ci armature |51 andits back-contact,armature 54 and its backrcontact, bank contacts engaged'V by the switch wiperfliil, back contact and arma# ture 163 and-motor magnetl to battery. This circuit serves to bring about the continuedoperation of the motor magnet l58to advance the switch wipers'into their normal position. The

fremoval of ground from thelreleaseconductor bank contacts. i i

Therotary switch RS is restored to normal in the same manner as previously described, In the connector "switch C, if the' called subscriber has no-t 'yet 'placed-hisreceiver upon the switch hook, the circuit'of the release magnet is main'- tained opedand the connector is not released until the calledsubscriber hangsup-hisreceiven Therotary switch RS--Z is, however,v restored to normal A'by the connectionlof ground to the bank contacts accessible to wiper 215, which brings about the continued operation of 'themotor margnet M54 in an obvious manner. rIAhe switch wipers 213 to 21,6, inclusive, are rotated totheir normal position. When thecalledsubscriber hangsv up thereis a releasev circuit established for bringingabout the Areleasegof the connector,Qwhich may be traced from ground Yby Away of armature 23! and' its back contactarmature 3 3 and its` back contact, armature 223 and its back contact, 0ST-V normal springZl and its workingv contact, back contact and'armature v21|,"and releaseinagnet Sill to battery. The release magnetlll is operated over-this circuit to restore switch wipers of the connector switch `to normal. The deenergizationof therelay Z responsiveto the called subscriber replacing his V,receiver brings about the de-energization of the relays 2131' and GIID,Y and these relays retracttheirrarmatures to to normal. "'Attention is directed tothefactrthat the selector switchrS cannot be restored to normal until,v the rotary switch RS-i is in normal position, thoughifA thecalling subscriber replaces his'receiver upon the switch hcolgim'mediately afterl the called.` party `answers and before a charge is made'or responsive to his initial tone indicating a charge about tobe made, the meter-v Illl will not be operated." This provision is made so, that there-willbe no chargerin the eventv a wrong number-is'obtai'ned.

the called subscriber does *not immediately re'- place hisy receiver and the connector 'remains in operated position, ground ,is connected by -`way of.l armature 223andv its front 'contact to theY supervisory signal: to indicate this fact; andan attendant can remedy the situation, ii the con-r dition persists.

. It will now be assumed that during Athe andthe relays 52% and |2`l in the selector were v operated. As a result of'these operations the rotary switches RS-I and RS-Z associated withthe selector S and connector C respectively, begin to operate in the same manner as described.r The charge will be against the calling line until thesubscriber at sub-stationT-l depresses his push button 335. `When this occurs the shunt around the resistory 335 included ,in the Vline circuit is removed and themarginal relay 2B! in the connector C is de-energized.. Bythe deenergization of this relay a point in the circuit ofthe lower winding 0f the diierential relay ESS isopened `and a circuit is provided for the upper winding of vthe differential relay 2&33, provided of courseitherin'eterng switch or time switch M--l is in the proper position with the relay 282 energized, The circuit for the upper wind ing of the. differential relay 28's extends from ground by wayof front contact and'armature 2M, front contact and armature 229, armature 222, and itsfront contact, armature 'E25 and its back contact, armature' 226 and its front contact' and yupper winding of diierential relay 203 of the-de-energizationof the relay ES, the conm` nectionslof the line relay 295i with respecttc the trunk conductors till' and E93, is Vrestored to normal. Another result of .the operation of the relayiEiBS is that an armature 229 -in the circuit of both windings is opened. By the engagement of armature 239 of the relay 2i3 with its back contact, there' is a circuit completed extending from ground on release trunk conductor igt, armature ESG and its back contact,

back contact and armature 2l? and relay 253 Ihevrelay 253 is energized tofestab-V to battery. lish a locking circuit for itself at Varmature Zl to open a-point in the circuit of the release magx net at armature 2H to prepare a metering circuit at armature' 269 and to prepare a circuit at armature 263 for applying tone to the talking circuit.

Asa' result of the reversal of connections of the line relay EM of the connector as described by thede-energization of the differential relay 2il3, the current low through the lower winding of the electro polarized relay |12? is again changed and opposes the'current'now in its'upper winding. v'As a result of this operation` the armaturesV l and lil-570i Athis relay are retracted. The operation or"Y the armature |43 serves to complete a circuit forthe relay |25 over a path extending from Aground. on the release rtrunk conductor, armaturell and its back contact, arma- V ture H32 and its front contact, and relay 25 to battery. Relay H25 4is energized over this circuit to establish a locking circuit for itself at armature [3Q-to open a point in the circuit eX- tending to the meter of thefcalling telephone at armature |40 to prepare a point in the release circuit at armature |4| and to open the connection by which tone through the switch RS--I is applied to the talking circuit at armature |66. As ak result of the energization of relay |25 the continued operation of the rotary switch RS-I is ineffective. Y

When the ca-lled subscriber releases the push button 336. a shunt is again replacedaround the resistor 335 and the relay in the connector is again operatively energized to attract its armatures 224, 225 and 211. The operationof its armature 225 opens a point in the circuit of the upper winding of the differential relay 203, while the operation of the armature 211 opens a point in the circuit of the relay 263. The operation of the armature 224 serves to again establish a circuit for the lower winding of the differential relay 203, whereby the connections of the line relay 204 with respect to the talking conductors |91 and |98 is again reversed. The reversal of these connections again brings about the energization of the electro polarized relay |21 in the connector S, but its operation has no particular function at this time.

It will be recalled'that when the relay 203 was originally energized, the motor magnet 264 of the rotary switch RS-Z was operatedand that the wipers of the rotary switch RS-Z were advanced one step into engagement with the second set of bank contacts. By this advancement the original circuit for Ythe motor magnet is broken at the wiper 215 and another circuit was established for this magnet, which extends by way of the' wiper 216, second set of bank contacts, armature 261 and its back Contact and commutator 285 on the shaf-t 288 to ground. The motor magnet is periodically operated by the operation of the commutator 285 advancing the switch wiper step by step at a definite rate of speed. When the switch wipersY are brought into engagement with the four-th from thelast set of bank contacts, the circuit for operating the motor magnet above described is switched to the commutator 281 on the shaft 288, which moves uniformly. When the switch wipers are advanced into engagement with the third from the las-t set of bank contacts, if the subscriber of the called sub-station has depressed his push button at this time to bring about a reversal of charges, a tone from the tone machine 280 is applied to the talking circuit over a path that may be traced from the tone machine, commutator 283, third'from the last set of bank contacts, wiper 214, front contact and arma-ture 268, condenser and thence to the talking circuit. This tone apprises the subscribers that a charge is about to be made. The tone may be of different pitch than the tone connected either to the conductors |90 or |9| associated withrthe selectors, and apprises the subscribers the charge is to be made against theY called telephone. When the'switch wipers are advanced into engagement with the second from the last set of bank contacts, the ltone from the'tone machine 20| is connected to the talking circuit and will apprise the subscribers thata charge is being made against -the called telephone. As before described, the shaft 288 of the metering equipment M-2 may be driven at varying rates, depending upon the time or traffic 4conditions to make a charge in accordance with the amount of traffic in the exchange or in accordance with the time of day. l

When the switch wiper 213 is brought into engagement with the last set of bank contacts there is a metering circuit completed, which extends from the metering battery B-I commutator 204, wiper 213, last bank contact, front contact and armature 269, front contact and armature 218, front contact and armature 245, wiper 2|4, bank contact 292, conductor 300, and meter 352 associated with the line switch of the called telephone to ground. The meter 352 'is operated to assess the charge against the called telephone.

When the switch wiper 213 was in engagement with the second from Ithe last set of bank contacts there was a circuit completed for the upper winding of the relay 262.v The relay 262 is energized to establish a locking circuit for itself at arma.- ture 266, which extends to release trunk ground, and connects the impulsing'circuit -through the commutator 286 to provide that faster operation of the timing switch RS-2 during its second operation may be had. So-long as the subscribers at sub-stations T and T-l are in communication, the time charge will be assessed against the called telephone in accordance with the traic conditions.

When the conversation is nished the subscribers will replace their receivers upon their respective switch hooks and the various switches employed in the connection will be restored to normal in the manner already described.

Attention is directed to the fact at this time that in the event the called subscriber hangs up and the calling subscriber maintains the connection, the de-energization of the relay 200 responsive to the replacement of the switch hook at 'the called telephone opens the metering circuit, at armature 218 so that the calling subscriber cannot make an unfair charge against the called subscriber, l Y

When the conversation is terminated the subscribers will replace their receivers upon their respective switch hooks. As a result of the replacement of the receiver at the calling station, the line relay 204 inthe connector C will be deenergized and the slow acting relay 205 will be de-energized a short time thereafter to remove ground from the release trunk conductor |86, thereby bringing about the release of the line switch RS, selector S, and the restoration to normal of the timing switch RS-|, individual to the selector in a manner similar to that already described. The de-energization of the relay 205 also causes the timing switch RS-Z to be restored to normal by applying ground Ytothe bank contacts accessible to the wiper 215. This ground connection causes the motor magnet 264 to operate to rotate the switch wipers 213 to 216 inclusive, to their normal position. When 'the called subscriber hangs up, the circuit for the release magnet 2|| is completed and the connector switch C is released in a manner similar to that already described.

From the foregoing it will be seen that there is a time charge made against the calling line upon the response of the called line under the control of a rotary switch, such asV RS-I individual to the selector used. It is desirable that the rotary switches such as RS-I be rota-ted relatively rapidly under the control of the impulsing device |13, somewhat more rapidly under the control of the impulsing device |12. This arrangement should be so that the initial rotation of the rotary switch RS-I will occur in approximately Itwenty seconds, though this period may-be varied as de# sired, and that the second rotation will occur at a relatively faster speed. Thisprovislon should beA 2, o 07,71 madam orderthat the 311mg subscriber Cannot hold a conversation with the called subscriber for any particular periodof time for the charges made. The meters such as |01 and 352 can-be regulated to make the proper charge for the usual fact that means arejprovided for indicating tov the subscribers which line the charge is being assessed against and also whenl the charge is made. Y A 2 The telephone sub-station T--2 is somewhat modified so that instead of the push button such as 331 removing the short circuit about a resistor, the depression of the push button grounds one side of the line. `This grounding may be employed to operate a relay such `as 20| Vin the con'- nector of the differential type instead of a mar-` ginal relay in an obvious manner. Under these conditicnsthe results will be identical with those described;

In a metering system such as has been described it is desirable that certain telephone lines such as those belonging to the telephone company be arranged for a free charge, so that `no charge will be made to the calling Yparty in the event connection is made Awith any of these lines. In order to Vaccomplish this result the line eX- tending to a free telephone is provided with the relay equipment associated with the line switch, such as Pts- 4. The bank contact which ordinarily would be connected to the meter in the connectors such as 293 is connected through a resistor to ground. f Y

A short description.` of the matter in'which a call is madeV to a line of this character and the functioning of equipment under these conditions,v

and particularly-the difference between this kind of a call and a regular call will now be described.

Y In establishing thejconnection from the calling telephone T Vto the called telephone'T-3 of the` free class, line switch'RS of the calling line` and a selector such as S, and a connector suchV as C, will be operated in identically the same manner as before described to establishthe connection. It will be assumed that the selector switch Sand the connector C are the ones employed to establish the connection.V ConnectorY switch C will bev operated so as to bring its wipers 2|6'to 2|9 in,- clusive, into engagement with the bank contacts 293, 291 and 295 and 299, respectively. The;bell. at the sub-station T3 will be operated periodi-` cally to v:summon the subscriber thereat; -When the party at the telephone T-3 removes his receiver from the switch hook, the ring cut-off relay- 201 is energized to establish a locking circuit for itself at armature 231 and connect the, called line to battery through the back bridge relay 200 and, the marginal relay 20| vBoth theserelays arel operated withfthe same results as before. The differential relay 203 is alsoenergized to reverse the connections-of the line relay 204 with respectV to the trunk conductors |91 and |98. It will'be seen `that the relay 3|9 is included in the line circuit of the called telephone in parallel with `a non-inductive resistance so as to provide a clear pathfor Yvoice currents, Vand `partially to .shorty plied. Whenr'relayS |`9 is adjusted not to respondY to ringing current, howeventhe relay 3 I9 is energized in series with the relays 200 and 20| of the connector. The relay 3|9 uponoperating completes a circuit for the slow tooperate relay 3|8, and the relay SIB is made slow to operate to give the relays 209 and 20|, as well as the relay 203,

time to operatevbefore this relay isY energized.

The operation of the relay 3,!8 serves to complete a circuit for the relay 3|1 at armature 333 and to open the-short circuit around the resistor 336 at the armature 335. The removinguof the short circuit around the resistor 336 includes this resistor in' the circuit and permits the marginal relay 20| in the connector C to de-energize to retract its armatures;V The relay 3|1Hupon energizing, opens a point in the circuit of the relay 3|8.Y at armature 33| and Vcompletes a locking circuit `for itself at Varmature 332 to ground upon the release trunk conductor 306. The relay 3m is de-energized after an interval of time to open the original energizing circuit of the relay 3 I1 `and to again short circuitthe resistor 336.

In the connector 'switch C the relay 20| upon de-energizing,` completes a circuitfor the upper winding of the differential relay 203. The diifer- Y ential relay` 203 retracts its armatures again to reverse the connections of the line relay 204 withV respect tothe trunk conductorsv |91 and |98, thereby bringing about the energization `of the relay |25 in the selector switch S. The operation of this relay renders l'the functioning of the timing :switch RS-.I individual to the selector ineffective, it being remembered that this switchV was' started by the operation' vof the electro .polarized relay4 |21 responsive to the'rst reversal of current overthecondiictorsfy The operation of the differential relay 203 brings about the'en'ergizationA of the" relay 263 "andbrings nthe timing switch RS--2 into'play; However, since themetering wiper 2 I4 extends tofgroundA through a re-Y sistor by way of the bank contact 293, the metering switch RS-2 is ineffective to= assess any charge, therel being no'meter'connected' with the telephone T-,3, kasit is an official Vor free telephone. In this manner no charge is madeto the calling subscriber whenihe calls a free telephone number.

Wheni the conversation is terminated thevlcon'- nection lis released in a manner similar-to that already described,l 1Y f' Itis possible in -a telephone system of Ythis character` that some of the lines other than com-V pany lines may not be provided with meters, but.' 'In this in-` be operating on ailat rate basis; stance therewill be no meterconnected to this classoi' lines. The meter bank contacts 293'in the various connectors having access'tol this class of lines-are simply left open. The purpose Ofulveavingthese bank contacts vopen 'f is toiprevent the called party exercisingv any control whatsoeverV over the 'metering charge.' It will be seen :that if the :bankcontact ysuch eis-293 is leftropen there is no circuit that'may be comenergization of the differential relay '203.

the metering charge to the callingparty, which he might do were it-not for this'provision.`

From the forego-ing .it will be obvious' also thata` certain amount of the charge maybe assessedagainst the calling'line and thereafterV further chargemaybe maderagainst the called party exercises. his reversecontrol- Y The clock switch M-I provides` means by which, during certainfhours of the day,V a-,certaeiin bnationy of telephone lines, a metering device associatedwith each line, means including automatic switches for establishing aconnection;

between a calling and-y called? one ofr saidl lines,

and means for voperating the-metering device on'- f either the calling or calledlinerafter the estab,-

lishment of'said connection, starting of the operation of thevmeter-on` the; called1line; being-op-V tionally controlled over'the calledline at'any time afterthe connection4v is; established;

2. In-y an automatiotelephone system, thecombination of telephone lines, a metering' devicev associated: with each line,` means including auto;-y

matic switches for establishing; a connection: be-

tween a calling and: called onelof said lines, and" meanscontroiledffrom: one ci. the telephone lines after the connectiona is. established, for operatingthe meter on thecalling or; called;` line over a part of said; connection. extending from thecorresponding calling or called end? of the connec-` tion, the starting oi'.' the'V operation ofiA the calledi meter beingoptionallyy controlled byl the calledv subscriberV at any time after the connectionv is established; Y

3; In an automatictelephone system, the corn-v bination of;r telephone. lines, 'a metering deviceV4 associated'f with` eachli'ne,- means including aut'omatic switches for establishing a connection between a calling andicall'ed oneof saidlines, andl means optionally'controlledfrem thel calledi tele phone line at anytime after the connection is established for starting-'andj continuing the operation of themeter on thecalledf line;

4. In an automatic telephone systemthe combinati'o'nofl telephone'` lines, -a meteringI device associatedwith eachline, means including automatic switches for establishing a connectirm` between a calling andiy called one ofV said' lines, means normally' operative to start the calling line meter responsive to. the connection, andi means for starting andcontinuingthe operationv of the meteron the called;- line under theconftrol of the subscriber thereat as a result ofthe establishment of the connection. Y

5. Inan autornaticitelephone-system, the combination of telephone lines, ametering-*device associatedr with each line, means including automatic switches for establishing al connection be` tween a calling andicalled one'l of saidlines, and

means controlled at the option of" the 'called telephone line vat any time after the connection is established for initiating* and continuing the periodic operation of" the meter on the called line as a result offthe establishment of the connection. Y

6. In anautomatc telephone system, the combinationof telephone lines, a; metering device associat'ec(A witlt each` line, means .includingi automatic 'switches for establishing a connection:

betweenY aj calling and called: oneof said lines, means for operating the meter on; the calling.

line, depending upon` that-imc at which the called,

lineresponsive to a replyfrom the called line, andr means for continuing the operation of the meter associated with theA calling line or effecting thev operation of the meter of the called line periodically at any time while said connection is maintained, at the option of the subscriber onthe called line.

7-. Inan automatic telephone system, the combination of telephone;` lines, a metering device associated with each line, means including automatic switchesfor establishing a connection between a calling andcalled one of'said lines, means normally operative responsive to the connection for-operatingY the meter associated with the calling lineA during an initial portion of the time that said; connection is establishedY and means for operating the meter onthe called line during another portion of the time that the connection is maintained;

8. Inian automatic telephone system, the combination of telephone lines, a metering device associatediwith each line, means including automatic switches for establishing a connection between' aicalling and called'one of saidlines, means normally: operative responsive to the connection for. operating the meter associated with the callingline during an initialportion of the time that said connection is established, and means for operating the meter on the calledline during another portion ofI the time that the connection is maintained; said latter means being controlled froml the called line.

9i In an automatic telephone system, the com,- bination oi telephone lines, a, metering device associatedfwith each line, means including'automatic switches for establishing a connection betweenf aVA calling and 'called one of said lincs, means for operating the meter on the calling linev as a resultof the establishment of the connection?. andfremoval of.' the called receiver and'means for signalling the subscriber at the calling station to indicate the operation of said meter.

10.1 ny an` automatic telephone system, the

combination of telephone lines, a metering devicef associated with each line'means including automatic switches for establishing a connection betweenfa calling andi called one of said lines. means for operating the meter on either the calling or called line, and means for signalling the subscribers on said lines to indicate against which line the charge is made.

111. YIn an automatic telephone system, the combination of telephone lines, a metering device associated with eachline, means including automatic switches for establishing a connection between a calling and called one of said lines, means normally operative to start the calling line meter responsive to the connection, means controlled bythe called subscriber for initiating and continuing the operation ofthe meter associated with the called' line periodically while said connection is maintained; and means for varying the periods of time between saidmeter operations.

l2. In anautomatic telephone system, thev combination of telephone lines, a metering device associated. witheach line, means including automatic switches for establishing a connection between a calling andl call'ed one of: said lines, means normally operative to start the calling line meter responsive to the connection, means controlledtbythe-called subscriber for initiating andi continuing the operation ofthe'meter associated with the called line periodically while said connection is maintained, and means for varying'` theperiods of time between said meter operations.; depending upon thetime ofday during which the connection is established.

13. In anv automaticl telephone system, vthe combination of telephone lines, a metering device' associated with each line, means including automatic switches for establishing a connection between a calling and called one of-V said lines,

means normally operative to start the callingv tions, depending upon the trailic load of lex'- change. f l i 14. In an automatic, 4telephoneV system, telephone lines', ametering device individual to certain of said-lines,' meansincludinga automatic switches forV establishingv a connection between a'calling Vandcalledone of said lines, andmeans operative if there is a meter associated. witheach of the connected lines for i-lrst operating the calling meter and then the called meter at the option of the called subscriber.

15. In an automatic telephone system, telephone lines, a meter individual to certain of said lines, automatic switches including rst selectors and connectors for establishing connections between a calling and called one of said lines, a timing switch associated with each iirst selector, a timing switch associated with each connector, means under the control of the timing switch at the rst selector for operating the meter associated with the calling line, means under the control of the timing switch at the connector for operating the meter associated with the called line, and means under the control of one of the lines for. determining which timing switch will be effective to operate the associated meter.

16. In an automatic telephone system, the combination of telephone lines, a metering device associated with each line, automatic switches including a'rst selector and connector for establishing aconnection between a calling and called one of said lines, a timing switch associated with said first selecto-1', means for initiating the operation of said timing switch as a result of the response of the subscriber on the called line, means under control of said timing switch for operating the meter associated with the calling line, and means controlled by the called subscriber to transfer the charge from the calling meter to the called meter.

17. In an automatic telephone system, the combination of telephone lines, a metering device associated with each line, automatic switches including a first selector and connector for establishing a connection between a calling and called one of said lines, means normally effective to operate the calling line meterresponsive to the connection, a timing switch associated with said connector, means for initiating the operation of said timing switch as a result of the response of the subscriber on the called line, and'means under the control of the called subscriber for rendering the calling line meter operating means ineffective and for causing said timing switch to become effective to actuate the meter associated with the called line.

18. In an automatic telephone system, telephone lines, a meter individual to certain of said lines, automatic switches including rst selectors and connectors for establishing connections between a calling and called one of said lines, a timingswitchassociated with" each rst selector, a. timing switch associated with each connector, means. under the control of the timing switch at the first selector for operating themeterassocated with the calling line, means under thecontrol of the timing switch at the connector for operating the meter associated with the called line, and means for initiating the operation of both timing switches as a result of theresponse of the subscriber onl the called line.

I 19. In an automatic telephone system, a combinationof telephone lines, a metering device Vassociatedwith each line, automatic switches including. a-irst selector and connector for establishing a connection between a calling and called oneof said lines, a timing switch associated with' iirst selector, anda timing switch asso-ciated with the connector, means'for initiating the operation of saidtiming switches as a result of the response of a subscriber on a called line, means controlled from the-called line for rendering the timingV line for causing the timing switch associated with said connector to become effective to actuate the meter associated with the called line.

20. In an automatic telephone system, the combination of telephone lines, a metering device associated with each line, automatic switches for connecting a calling and called one of said lines, means for operating the metering device on the calling and then the called line after said connection is established, and means controlled over the called telephone line for determining whether the called meter is to be operated or only the calling meter.

21. In an automatic telephone system, the combination of telephone lines, a metering Vdevice associated with each line, automatic switches for connecting a calling and called one of said lines, means for operating the metering device on the calling and then the called line after said connection is established, and means controlled over the called line for eecting said consecutive operation of both meters.

22. In an automatic telephone system, the combination of telephone lines, a metering device associated with each line, automatic switches for connecting a calling and called one of said lines, means for operating the metering device on the calling line after said connection is established, and means controlled over the called line for continuing the operation of the calling meter or electing the operation of the called meter and stopping the continued operation of the callingv line meter.

23. In an automatic telephone system, telephone lines, a metering'device individual to said lines, means including automatic switches for establishing connections between calling and called lines, and means made operative if there is a meter associated with each of two connected lines for operating the calling meter and then the called meter for the duration of the connection at the option of the called subscriber.

24. In an automatic telephone system, telephone lines, a metering device individual to each line, automatic switches for establishing connections between calling and called lines, means for operating a calling line meter responsive to the removal of the receiver of the called line, and means for thereafter transferring the registration of the call from the calling meter to the scribefn f 25.. Inan automatic telephone system, telephone lines, a metering deviceindividual to. each- 1ine,fa.utomatic switches for establishing connections between calling and called lines, means for operatingacalling line meter responsive to the removalof the receiver of the called line, and meansfor transferring the registration of the-call from the calling meter to the called line meter at the optiony of the called subscriber at any time during the maintenance of the connection.

26'.: In an automatic telephone system, telephone lines, a metering device individual to each line, automatic switches for establishing a connection between a calling and a called line, a timer' for operating the calling line meter, a timerv for-operating the calledline meter, means fortoperating the-calling line meter by its associated timer-responsive to the removal of the receiver of the called line, and means optional with the called subscriber to operate the called line meter `by: its timer to start the registration of the call: andstop. the calling meter for the remainder of the call.

27. In antautomatic telephone system, the combination of telephone lines, a metering device associatedwith. each line, means including automatic switches for establishing a connection between acalling and'call'ed onev of said lines, means for operating the meter device on the calling line as a result of the establishment of the connection and removal of the called receiver, means for signalling the subscriber at the calling station an intervalv of time before the meter is so operated and' for sending a second signal to the calling subscriber to indicate. that the meter is being oper-f ated.

MILTON S. FRIENDLY, CENTRAL TRUST COMPANY OF ILLINOIS, Byv CHARLES J. GREENEBAUM,

Assistant Trust Omcer, Cri-executors ofthe Estate'of Herbert M. Friendly,

Deceased. 

